<template>
  <view>
    <!-- 搜索组件 -->
    <my-seacher></my-seacher>
    <view class="scroll-view-container">
      <!-- 左边滚动区 -->
      <scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scorll-item', i === activeIndex ? 'active' : '']" @click="currentActive(i)">
            {{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右边滚动区 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  // 导入自己封装的 mixin 模块
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    // 将 badgeMix 混入到当前的页面中进行使用
    mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        cateList: [],
        // 二级分类列表
        cateLevel2: [],
        activeIndex: 0,
        scrollTop:0
      };
    },
    onLoad() {
      // 获取当前系统的信息
      const sysInfo = uni.getSystemInfoSync()
      // 为 wh 窗口可用高度动态赋值
      this.wh = sysInfo.windowHeight - 50
      // 调用获取分类列表数据的方法
      this.getCateList()
    },
    methods: {
      async getCateList() {
        // 发起请求
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        // 判断是否获取失败
        if (res.meta.status !== 200) return uni.$showMsg()
        // 转存数据
        this.cateList = res.message
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      currentActive(i) {
        this.activeIndex = i
        // 为二级分类列表重新赋值
        this.cateLevel2 = this.cateList[i].children
        // 让 scrollTop 的值在 0 与 1 之间切换
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 240rpx;

      .left-scorll-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;

        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;

          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 6rpx;
            height: 60rpx;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }

    .right-scroll-view {
      flex: 1;
      background-color: #ffffff;
      .cate-lv2-title {
        font-size: 24rpx;
        font-weight: bold;
        text-align: center;
        padding: 30rpx 0;
      }
      .cate-lv3-list {
        display: flex;
        flex-wrap: wrap;
        .cate-lv3-item {
          width: 33.33%;
          margin-bottom: 20rpx;
          display: flex;
          flex-direction: column;
          align-items: center;
          image {
            width: 120rpx;
            height: 120rpx;
          }
          text {
            font-size: 24rpx;
          }
        }
      }
    }
  }
</style>
